The Church of the Brethren is an Anabaptist Christian denomination in the Schwarzenau Brethren tradition that was organized in 1708 by Alexander Mack in Schwarzenau, Germany during the Radical Pietist revival. The denomination holds the New Testament as its only creed. Historically, the church has taken a strong stance for nonresistance or Christian pacifism—it is one of the three historic peace churches, alongside the Mennonites and Quakers. Distinctive practices include believer's baptism by forward trine immersion; a threefold love feast consisting of feet washing, a fellowship meal, and communion; anointing for healing; and the holy kiss. Its headquarters are in Elgin, Illinois, United States.

Anabaptism is a Christian movement which traces its origins to the Radical Reformation in the 16th century. Anabaptists believe that baptism is valid only when candidates freely confess their faith in Christ and request to be baptized. Commonly referred to as believer's baptism, it is opposed to baptism of infants, who are not able to make a conscious decision to be baptized.